Kendall and Kylie Jenner Stun at Launch of Their New Clothing Collection In NYC -- Who Showed to Support?

The sisters stepped out in New York City on Monday for the launch of their Kendall & Kylie Collection, both stunning in edgy pieces from their brand new clothing and footwear line.

The 20-year-old model showed off her killer legs in a gray thigh-high slit dress and a Lily E Violetta fur coat. She finished the look with the Emily lace up sandals from their line and accessorized with polished waves and natural makeup.

Her 18-year-old sis looked cute in a black sleeveless tuxedo jumpsuit and the Alisha pumps from the collection. She kept warm in a black fur coat with leather sleeves and finished the look with a suede Balenciaga backpack.

The fashion forward siblings celebrated their latest venture with a TriBeCa loft party and got some major support from mom Kris Jenner and brother-in-law Kanye West, who were snapped inside the event. Also in attendance were the duo's BFFs Hailey Baldwin and Gigi Hadid, along with Victoria's Secret models Martha Hunt, Devon Windsor and Josephine Skriver.

This isn't Kendall and Kylie's first venture into fashion. The sisters previously had capsule collections with PacSun and Topshop.

"We designed it according to what we love, and how our style is," Kendall told PEOPLE at the event. "It's someone who is really similar to us. A young girl wanting to have fun. That's mainly what we designed."

"We absolutely tried on everything, you can't wait to see how the finished product turns out," Kylie said before Kendall added, "It's an exciting process, and when everything is done you're like 'Wait, get me everything. I can't wait to try it.'"

Kendall and Kylie'e new line will be available at Bloomingdales, Shopbop, Nordstrom, Neiman Marcus and Saks Fifth Avenue.